Buffer



Patented Mar. 29, 1927.

f Nrrsn STATES L-PMENT :1.o Feier.

lDAVID BOURQUE, F 7AMESBU'RY;zIIlIASSACHU'SE'ITS, ASSIGNORfTO G: W. JZMMURP-HY l f COMPANY, OE AMESBURY, MASSACHUSETTS, A CORPORATION-OF MASSACHUSETTS.

u BUFFER.

, Application ledctober 12, 1922.., Seria1 No..594,018.

i Thisinvention srelates to buffers or cushv.ions andthe object 1s towprovide a device embodying a resilient cusli ioning member which may be convenientlyy adjusted for,

aspect be considered as an improvement on the device disclosed in Letters Patent 1,385,448to-dohn H. Harward. As comparedvvitlrthe device of that patent `I provide a more refined construction and in n pa1ticularHonein Whichthe bufferblock is ,securelyheld in its loperative position at all .times.

My invention will best be.` understood by reference to the following ydescription of the particular illustrative lembodiment thereof illustrated `in thel accompanying-drawings, ...wherein .Figa l is asection through a door adjacentthe jamb showing in elevation the jamb lining With a device embodyingmy invention applied thereto;

Fig. 2 is a similar .view Withpart of the yjamb ,lining 4broken away to show the device in longitudinal ,section Fig. Bis a sectionon the line3-3 of `Fis 2;

Fig. 4 is thetop plan of thecasing utilized in thesdevice andv is on a` larger scale;\and

Fig 5 is a section on the line` 5 -5 ofy Fig. showing ,also aeeoperating part in separated position. Referring to Figs. l and 2 ofthe drawings, I .have there shown a portion of the njalnblining 5 of a ,door having the usual Irebate Tinwhich the door 9 is adapted t0 close. The device here shown as an example of my` invention is adapted to be applied t0 .the l.j amb lining and to present a cushion Vmeans for positioning come displaced through such,

screws, as shoWn, in themortise 11.; V)The casing may be ofparallelopipedal form and is provided with. .an open outerv end, facing the rebate '7 and preferablvhas `an opentop or face at the; outer side ofthejamblining (see Fig. 3). Ifprefer to dispensewithany removable top or coverforclosingthisopen side sincethe preferred v.form of my.,invention as hereinafter explained; provides a ,buffer,. blocl r in .the casing in such manner that it Willi-.net bean open .top While always readily accessiblefonadjustment therethrough. I,Housed Within. `the cas? `ing is the buffery propert or eushioneonsis-ting of a suitable block. 15, of `resilient..ma-

terial-.such as rubber ada pted to.` fitffthe j Acasing .and having an Jend projecting from the open \endfthereof to` AContact.with .the door 9 as-illustratedin Figs. land 2., To

.hold the block 1,5 in. tlie casing..and.in .par-

ticular toprovide Aforadjustmentof the former as the projecting `end isinorn bjr-,use

I Umaygimbedin thef block a bowedmetal spring 17 having its convexity presented` towards thekopen end oftheeasing. and r:the ends 1-9 of Vwhich* areexposed atthejsides of the block and form lugs adaptedto engage in grooves 2 1 at the sidefof the1 ,casing, con venientljf j formed by striking vup ,the ymetal thereof intothe forni of a series ofvratchet .teeth 23 111 F ig. 3 IV have illustratedthe spring 17 as providedvvith -eut ,away portions-25 to yprevent `its being toostifand it may be yprovided with openingsIv 2'?il therein through which the rubber fomthe. block v15 may extend so thatthe3 block isA lfirmly bonded in position on thespring.

. `D iflieultv is experienced indoor buffersbe- 1canse the projecting end ofthe cushion. .may be caught in use` and twisted-i out4 of. .p0si tion. An open topped casing such as ,I have here illustrated presents various advantages of simplicity and eheapness yandalso: that of providing for access tothe .cushion atall times ,Without the necessity forJthe .use of tools. Thus, in theA example ofthefinyention shown the` cushion maybe lifted or pried :out otthe @renten 0f the.Casinaanfllenserted so that the; .ends 19- Of; the 'Sprnaret 111.91m 0f ythe, groeve@ 2l.` further to. the-.right Viewing .Fie f2, than is. shown@ and. .thu.s..the

imgawaitl 0f. fthe. Quter endfo the-sushi@ through use may be compensated for. Referring to Fig. 2, it will be noted in striking up the teeth 23 I have placed them adjacent the middle portion of the casing between its ends and that the springl 17 is also placed substantially centrally in the block 15 remot-e from the rear end thereof so as to provide a considerable body of rubber at the rear of the spring instead of so arrangingit that the lugs 19 formed by the end of the spring would be presented at the eXtreme rear end of the block. If now a force is applied to the end of the block 1 5 at the right in Fig. 1 tending to move it towards the reader and it tends to turn on the lugs 19, such turning movement will be resisted by the body of the block at the rear of the spring. By a slight sacrilice of range of adjustability a more adequate positioning of the block in practice is provided for.

Referring now to Fig. i, in the preferred form of my invention in striking up the teeth 23 to form the grooves 21 they are ranged at an angle sloping inwardly and rearwardly from the open top of the casing` and the ends of the spring are correspond ingly disposed. The expansive action of the spring, therefore, exerts a tendency tending to draw the block downwardly into the eas ing and to prevent its displacement from the open side thereof. To displace the block 15 requires not only a transverse blow but a force .exerted lengthwise of the easing and the spring is thus more firmly held in position. In the action of the buffer, as the door closes against the end thereof and strikes a blow on the block 15, the tendency is to drive the lugs 19 inwardly along the slanting grooves and seat the block against the bottom of the casino.

As a further security, as is best illustrated in Fig. 5, the bottoms of the grooves may flare from the open side of the casing towards the back to provide an undercut seat so that the distance between opposed grooves is greater at the side nearer the back than at the side adjacent the open top of the casing. In striking up the teeth from the body of the casing as herein shown, the metal of the wall may be pressed outwardly to provide this increased distance as is indicated in dotted lines at 27 in Fig. 3 but in the subsequent formation of the casing this projecting rib may be slabbed off or rolled down. It will be seen from Fig. 5 that the wall of the casing is somewhat thinner adjacent the right hand side of the teeth than at the left. This construction providing an inward flare on the bottoms of the grooves is convenient in practice but is somewhat difficult to illustrate. Since the drawing represents a preferred mechanical embodiment of the invention. I have herein explained this matter in considerable detail. It will be, of course, understood that the flare of the bottoms of the grooves might be provided for in any desired way and that the particularity of this description is simply to prevent a possible misunderstanding of the disclosure.

The ends 19 of the spring 17 are bevelled to correspond with the flare of the seat. The buffer is inserted by a slight compression of the spring 1? and a movement of the entire cushion inwardly through the open top of the casing` from the position shown in Fig. 5 towards the left and the spring expanding is caught as in a dove-tailed joint in the grooves 21. `Because of the resiliencyv of the spring the cushion may be removed when desired for purposes of adjustment but the construction effectually aids in preventing accidental displacement.

In the form of invention shown embodying the use of a bowed spring 17 to provide for holding the cushion on the casing not only is the resiliency of the rubber to the right of that spring utilized in the cushioning action but the spring itself may yield to the heavier shocks. The spring grips firmly in the casing and without loose play and although the contacting of the lugs 19 with the walls of the casing is between metal and metal there is no rattling and noise.

I have described in detail the particular embodin'ient of my invention here shown by way of example togetner with all the details of construction which may preferably or conveniently form apart of such a device. It will be understood, however, that all these details are not essential to my invention in the broader aspects thereof and the snbjeci` matter of invention exemplified by the above specific disclosure which I claim as new and desire to secure by Letters Patent I shall es press in the following claims.

Claims:

1 A buffer of the class described comprising a casing having an open top and an open end and interior teeth at the sides, a resilient block received in the casing and adapted to project from the end thereof and a spring imbedded in the block and having its ends projecting to engage the teeth.

2. A. buffer of the class described eemprising a casing having an open top and an open end and an open side and interior teeth at the sides, a resilient block received in the casing and adapted to project from the end thereof and a bowed springassociated with the block presenting its conveXity towards the open end of the casing and its ends to said teeth.

3. A buifer of the class described comprising a casing having an open end and having interiorly presented grooves in medial position at its sides, a resilient block having holding means associated therewith comprising lues to seat in said grooves and having a substantial body rearwardly thereof to engage the rear of the casing and prevent tipping of the block under forces applied to an end thereof projecting from said open end of the casing. n

4. A buffer of the class described comprising a casing having an open end and a resilient block received by the casing to project from the open end thereof and having means between the ends thereof for adjustably engaging it with the walls of the casing and providing a substantial body forward of said engaging means and receiving the buiing shock and a subst-antial body at the rear thereof cooperating with the casing to prevent tilting of the block under bui'ling shock.

5. A buffer of the class described comprising a casing having an open end, grooves at the sides of the casing-having flaring bottoms and a buffer block having holding means associated therewith comprising relatively resiliently compressible lugs adapted to fit the grooves.

6. A buffer of the class described comprising a casing having an open end, opposed grooves in the side walls thereof together constituting an undercut seat and a buffer block having a bowed spring imbedded therein presenting its ends at the sides thereof, said ends being bevelled to it the seat.

7. A buffer of the class described comprising a casing having an open end, opposed inwardly and rearwardly sloping grooves in the side walls thereof together constituting an undercut seat and a buffer block having a bowed spring imbedded therein presenting its ends at the sides thereof, said ends being bevelled to lit the seat.

8. A buffer of the class described comprising a casing having an open end and an open top and having sides provided with grooves sloping inwardly and rearwardly from said open top and a buffer block adapted to project from the open end of the block and having a bowed member associated therewith presenting its conveXity towards the open end of the casing and having its ends seating in the grooves.

9. A buffer of the class described comprising a casing having an open end and an open top through which the hereinafter mentioned block may be inserted and having series of teeth along its sides and a buffer block received in said casing having lugs presented at its sides to engage with said teeth, which lugs are resiliently compressible towards one another.

10. A buffer of the class described comprising a casing having an open end and an open top through which the hereinafter mentioned block may vbe inserted and having series of teeth along its sides and a buffer block received in said casing having lugs presented at its sides remote from the rear end thereof to engage with said teeth, which lugs are resiliently compressible towards one another.

11. A buffer of the class described comprising a casing having an open end and an open top through which t-he hereinafter mentioned block may be inserted and having its sides formed to provide an undercut seat and a buffer block received in said casing having bevelled lugs presented at its side, which lugs are resiliently compressible towards one another to be entered into said seat and expansively to engage therewith.

12. A buffer of the class described comprising a casing having an open end and an open top through which the hereinafter mentioned block may be inserted and having its sides formed to provide an undercut seat and a buffer block received in said casing having associated therewith a bowed fiat .spring having bevelled ends to fit said seat.

In testimony whereof, I have signed my name to this specification.

DAVID BOURQUE. 

